After recently banning old light bulbs, the province of Ontario has permitted a Californian company permission to build a rather large solar power facility.

The Ontario government has approved a California company’s plan to build North America’s largest photovoltaic solar farm, the provincial energy ministry announced Thursday.

OptiSolar Farms Canada Inc. of Arthur, Ont. — a subsidiary of California-based OptiSolar Inc. — will install more than one million solar panels at four farms outside Sarnia, Ont., providing the province with 40 megawatts of power by 2010. Ontario Energy Minister Dwight Duncan said that’s enough to power 6,000 homes.